Grinding machine and process



May 19, 1925.

H. VANDERBEEK GRI-NDING MACHINE AND PROCESS Filed June 2, 1923- Ai/Inventor:

' I: ame

ratented May 19, 1925..

UNITED STATES I 133%,?3 r ee,

HERBERT VANDERBEEK, OF CANTON, OHIO, ASSIGNOR TO TIMKEN ROLLER BEARINGCOMPANY, OF CANTON,

OHIO, A CORPORATION OF OHIO.

I GRINDING MACHINE AND PROCEQEQ.

Application filed June 2, 1923. Serial No. 642,979.

To all whom it mag concern:

Be it 'known'tha t I, HERBERT VANDER- urn, a citizen of the UnitedStates, and a resident of the city of Canton, in the county of Stark andState of Ohio,have inventeda new and useful Improvementin Grind thecenter line of the roler, the center line of the grinding wheel/and. thepoint 7 of contact are in a straight line at the completion of thegrinding and the translatory movement ofthe grinding wheel continuesuntil the center thereof is carried past said line. The inventionfurther consists in the process and in the machine, partsandcombinations of parts hereinafter described and claimed.

In the accompanying drawing,

Fig. 1 ,is a front elevation of a-grinding machine embodying myinvention; and Fig. 2 is a side elevation thereof.

Rotatably mounted ini suitable bearings 1' on the frame 2 of a grindingmachine or the likeare driving, chucks or spindles 3 between whichisheld the article to be ground. In the drawing, this-article is aconical roller 4 for use in .roller bearings. In the drawing is shown apreferred form of drive for the spindles 3 in which each spindle isprovided with a'pulley 5 that is driven by a suitable belt 6.. Securedto the frame of the grinding machine adjacent to the spindle pulleys arebrackets 7. @1 0 'each of the brackets 7. are secured pulleys8 overwhich passes the belt 6'," that drives the f spindle. The direction ofthe drive is indicated'by thearrowsin Fig. 2. The arrangement shown inthe 'drawmg results in the belt exerting a downward pull on thespindles/the pull beingin the general direc- ,tion of; the resultant ofthe forces acting on the-Feller as it is being ground.

away

Mounted on the frame of the machine so as to be adjustable toward andaway from the work holding spindles is a slide '9. A suitable'handle 10is provided for moving" this slide to the desired position. The slide 9preferably has a bifurcated'uppei" portion 11 and an arm 12 is pivotallysecured between the parts of the slide. Re-- tatably mounted'atthe-outer end of said arin 12. 1s a grind-ing wheel 13. The "grindingwheel-13 is provided with a suitable pulleyv 1 1 over which passes thedriving belt therefor. The end of the arm 12' opposite the grindingwheel 13 -is preferably provided with projections 16 to each of which issecured a pulley wheel 17 over which'passes the drive belt for thegrinding wheel. The' purpose of this arrangement is toex'ert ahorizontal pull on the grinding wheel. that tends to pull it away fromthe'work.

Mounted for cooperation with a suitable member on the grinding wheelorisupport-f ing arm is a cam 18 byv which the'grinding wheel may beraised. The cam18 shown in the drawings is provided with suitable meansfor rotatlng it.. The arm 12 on which'the grinding wheel 1351s mountedrests; on said cam, andas, the .c'amrotates, it swings thearm 12upwardly about its pivot. r-t't'ter the arm 12 has been.raised, thecontinued turning of the. cam 18 pern'iitsthe .arni

and grindingwhcelto lower by their own weight. lVhe'n a roller is inposition to be ground, the grinding wheel is raised? new the grindingwheel lowers th'r arcuate path,-. it roller and grinds arranged; that Hthe proper size w'l I roller, and," ti ng wheel andtthc point of con acbetween the roller lind grinding wheel are Preferably the axis aboutwhich the ariu 12 swings is in the samev line. As" the grinding wheelcontinues to lower, it gradually mechanism is so 1 n5 1 comes in contactwith the in a straightfliriey ceases to grind the roller. By thisurrange- I ment, the grinding wheel at first grinds deeply but it grindsless and lessuntil the I work is completed. It ,moves gradually from theroller iiistead of stopping work abruptly thus a oiding the formation ofrough spots or ridges on the roller and insuring that the rollers shallbe of accurately circular section throughout their length. In thedrawing, the grinding wheel is shown grinding conical rollers. The

grinding wheel may be adjusted for rollers oi diiierent degrees of taperor for cylindrical rollers. Iri 'erahly the axes of the grinding wheelarid, of the roller being ground are parallel and the taco of thegrinding wheel is inclined with respect to its axis, so that said faceconforms to the taper of the roller. Ditleient tapers may he taken careof by using grinding wheels Whose faces niahe diii'ercnt angles Withtheii axes or by changing the angular relations oi the axes of theYv'irh and of the grinding wheel.

The drive of the spindles is so arranged that the pull thereoi' is inthe same direction as the resultant. of the forces acting on the rollerbeing, ground. Thus there no tendeney for the rollers to move out ofposition and they are ground very.accurately. Like wise. the drive onthe grinding Wheel is dis posed so to exert a pull thereon in amore orless horizontal direction instead ot a vertical direction and thus thedrive does not tend to lift the grinding wheel from the Work and thendrop it onto the work. There is a certain. amount of looscness inhearings due to the existence of a film of oilthat may vary in thicknessand due to wear of the parts. The above described drive arrangementaiways forces the work holding spindle and the grinding wheel in onedirection against their respectivehearings.

The grinding machine and process hereinheiore described have numerousadvantages. 'lhey insure the accurate grinding ol': the worlg; giving,rollers a smooth finish and inahing them of accurately circular sectionthroughout their length. The machine is simple and easy to operate.

Obviously numerous changes may be made without departing from theinvention and I do not wish to he limited to the precise con structionshown;

' lVhat 1 claimis:

1. In a machine for grinding the hearing surface of rollers for rollerbearings and the like, means for rotatahly holding, a roller. a grindingWheel, and means for moving said grinding wheel in asubstantially.tangential path with respect to the bearing surface of theroller.

2. In a deviceof the kind set forth, means for r'otatably holding aconical rollerifor roller bearings, a pivotally mounted arm, a grindingwheel mounted at the end of .said arm for grinding the bearing surfaceof said lfillel'uand means for swinging said arm so that the axis oisaid grinding Wheel traverses the straight line iassing the axis of theWork and the pivot of said arm. 3. A grinding machine for grinding thehearing surtace oi rollers for roller bearings,

c oiuprising means for rotatahly holding a roller, :1 pivotedarm, agrinding wheel rotatahly mounted at the end of said arm, and means forswinging said arm to raise said grinding wheel and permit it to lower togrind the roller, said means permitting the grinding wheel to(illilPilQlG'W the straight line passing through the axis of the Workand the pirot of said arm.

(i A grinding machine for grinding the hearing, surface of rollers forroller bearings, comprisingmeans for rotatahly holding); a roller,pivoted arm, a grinding Wheel rotatahly inountedat theend of said. arm,and means for raising said grinding Wheel and permitting it to lower togrind the roller, said means including a can: and permitting thegrinding .wheel to drop heiow the straight line passing thiou rli-theaxis of the work and the pivot of said arm.

in a grinding machine adapted to grind the bearing? surface ofrollcrsfor roller hearings, means for rotatthly supporting a roller and forpositively rotating the same, a grinding Wheel, means for moving saidgrinding wheel in apath substantially.tangential with. respect to thebearing surface of the roller. the path of movement of the axisof saidgrinding wheel traversing a line perpendicular to the direction of itsmotion. and passing through the axis of the roller.

6. In a. grindingmachine, a drive mechanism for a Work holding spindle,comprisinga belt driven from alcove, a bracket secured to the frame ofthe machine and pulleys r0- tatahly secured to said bracket and guidingsaid belt, one of said pulleys beingbelow the level of theworh spindle,whereby the pull of the belt on said spindie is dow nviirdly, the,anglesheing sulistantially the same as the resultant oifother forcesacting on. the work. ,1

7. A process for grinding the hearing); surface of rollers for rollerhearings and the iihe that comprises,swinging a grinding Wl'ieei. abouta ,ivot in a oath such that the axis of the grinding wheel traverses astraight line that passes through the axis oi the Work and thehi'votabout which said grinding Wheel. is swung.

' May, 1923. VANDER-BEEK,

Signed at Canton, Uhiqthigi 28thday of

